[GitHub] [incubator-eventmesh] jinrongluo commented on issue #825: [Feature] Event Filter

[GitBox <gi...@apache.org>]

jinrongluo commented on issue #825:
URL: https://github.com/apache/incubator-eventmesh/issues/825#issuecomment-1099315094

   I have a quick look at Drools and EasyRule, their rules are not for filtering.  I think we need the simple rules like RocketMQ filters
   
   https://rocketmq.apache.org/docs/filter-by-sql92-example/
   
   for example:  $.subject == 'myservice'
   
   We can implement our own simple Rule engine to process this rules using Parse Tree (https://en.wikipedia.org/wiki/Parse_tree) and JsonPath SDK
   
   Concrete Implementation:
   
   1. Parse the Filter Expression into Parse Tree
   2. Evaluate each node of the Parse Tree using JsonPath, and Java API
   
   


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